1. Department
of Chemistry, Moscow State University, 119991 Moscow, Russia
2. Institut
für Anorganische Chemie, RWTH−Aachen University, Landoltweg,
1, Aachen, D-52074, Germany
3. Poncelet Laboratory, Moscow Center for
Continuous Mathematical Education, Moscow Independent University, 119002 Moscow, Russia
4. Physics
Department, Buffalo State College, 1300 Elmwood Avenue, Buffalo, New York 14222, United States